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8_murik_8 [283]

3 years ago

12

The metal rhenium becomes superconducting at temperatures below 1.4 K. Calculate the temperature at which rhenium becomes superc

onducting in degrees Celsius.

1 answer:

kotegsom [21]3 years ago

8 0

Answer:

The temperature at which rhenium becomes superconducting is -271.6 ºC.

Explanation:

We can convert the temperature given in Kelvin, which is an absolute scale, into degrees Celsius. which is a relative scale, by a simple algebraic translation, that is:

$T_{C} = T_{K} - 273$ (1)

Where:

$T_{C}$ - Temperature, measured in degrees Celsius.

$T_{K}$ - Temperature, measured in Kelvins.

If we know that $T_{K} = 1.4\,K$ , then the temperature given in degrees Celsius is:

$T_{C} = 1.4\,K-273$

$T_{C} = -271.6\,^{\circ}C$

The temperature at which rhenium becomes superconducting is -271.6 ºC.

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Finger [1]

Answer:

T = 3.75 K

Explanation:

As we know

PV = nRT

R =8.3144598 J. mol-1. K-1

P = 0.562 atm

V = 83.3 mL

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Substituting the given values, we get

0.562 atm * 83.3 *10^-3 L = 0.0015 moles * 8.3144598 J. mol-1. K-1 * T

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3 years ago

Working on-board a research vessel somewhere at sea, you have (carefully) isolated 12.5 micrograms (12.5 ×10–6 g) of what you ho

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Answer:

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Explanation:

From the question we are told that

The mass of saxitoxin is $m = 12.5 mg = 12.5 * 10^{-6} g$

The volume of water is $V = 3.10 mL = 3.10 *10^{-3} L$

The osmotic pressure is $P = 0.236 = \frac{0.236}{760} = 3.105 * 10^{-4} atm$

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Generally the osmotic pressure is mathematically represented as

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Generally the number of moles of saxitoxin is mathematically represented as

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=> $n = 1.295 *10^{-5} *3.10 *10^{-3}$

=> $n = 4.015 *10^{-8} \ mol$

Generally the molar mass of saxitoxin is mathematically represented as

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=> $Z = \frac{12.5 * 10^{-6}}{ 4.015 *10^{-8}}$

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4 years ago

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Dmitry_Shevchenko [17]

Answer:

Mole fraction is 0.2

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